“Failed to verify username”

What happened: when you joined, the server asked the session services to confirm your identity, and that conversation failed. Possible causes include a stale client credential, degraded session services, DNS or routing trouble, a server/proxy/firewall fault, or a target-specific verification policy. The message does not identify which one.

Your side, in order

1. Full restart: quit game and launcher, relaunch, rejoin. This often refreshes a stale credential.
2. Persisting? Sign out of the launcher, sign back in, launch, rejoin.
3. Still failing on several unrelated servers? Account/session-service trouble becomes more plausible. Check an attributable service report and retry later before changing software.
4. Failing on one server only while others work? The target’s verification path becomes more plausible, but route, DNS, firewall, or proxy differences can still matter. Record the exact time/message and tell its operator.

The pattern worth learning

Several-server versus one-server behavior is a clue, not a verdict. It narrows the next test without proving ownership of the fault. As always at this desk, no step above involves your password anywhere except the official launcher sign-in.